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热爱学习 发表于 2015-8-13 17:07
* q4 z0 ?+ `* ~, {; V/ \固体绝缘29.3的三条是选择性的,只要满足其中一条即可,厚度仅仅是其中一条,并非必须满足
9 F; [) d/ K0 i1 ~# \而且第三条就 ... 0 m; C" c/ h/ w
22.33 条款2的问题可以归结于对于可接触的导电液体单层绝缘是否可靠的问题,很明显,标准是认为不可靠的,水和金属应该考虑为一体,因为金属是导电没有绝缘的,做绝缘的只是单层的陶瓷体,就算陶瓷体可以做为加强绝缘,也是单层的,也就是说这种结构是绝对不允许的,考虑陶瓷体开裂的问题,还是直接包三层绝缘胶带比较靠谱- H( v8 \$ d/ p: V" T* h
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For class II construction, conductive liquids that are or may become accessible in normal
$ @& ^( N; v9 {use and conductive liquids that are in contact with unearthed accessible metal parts shall1 Y1 A: ~# h1 {' q! c* Q1 K( I
not be in direct contact with basic insulation or reinforced insulation unless the reinforced
2 Z6 D- C( {1 ?. O) @insulation consists of at least 3 layers. |
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